CVE-2026-57967

An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue.

  • Published Sep 10, 2026
  • CVSS 9.8 critical
  • 1.1% chance of exploitation in the next 30 days (EPSS)
  • A fix is available

Affected software

CVE-2026-57967 at the National Vulnerability Database